16355551 has 2 divisors, whose sum is σ = 16355552. Its totient is φ = 16355550.

The previous prime is 16355543. The next prime is 16355557. The reversal of 16355551 is 15555361.

It is a strong prime.

It is an emirp because it is prime and its reverse (15555361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16355551 - 2³ = 16355543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16355557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8177775 + 8177776.

It is an arithmetic number, because the mean of its divisors is an integer number (8177776).

Almost surely, 2^16355551 is an apocalyptic number.

16355551 is a deficient number, since it is larger than the sum of its proper divisors (1).

16355551 is an equidigital number, since it uses as much as digits as its factorization.

16355551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11250, while the sum is 31.

The square root of 16355551 is about 4044.1996736066. The cubic root of 16355551 is about 253.8370780278.

The spelling of 16355551 in words is "sixteen million, three hundred fifty-five thousand, five hundred fifty-one".